useKeyboardHandler

useKeyboardHandler is a hook that offers low-level but more powerful API in comparison to useKeyboardAnimation. Using this hook you are getting an access to keyboard lifecycle events and you can easily determine the moment of the beginning animation, the end of the animation and get keyboard position in every frame of the animation.

Example

useKeyboardHandler(
  {
    onStart: (e) => {
      "worklet";
    },
    onMove: (e) => {
      "worklet";
    },
    onEnd: (e) => {
      "worklet";
    },
  },
  [],
);

Worklet directives

Don't forget to add worklet directive to all onStart/onMove/onEnd handlers. Otherwise your code will throw exception.

These handlers are not workletized by default, since it's not a part of reanimated package.

Unlock 120 FPS on iOS

Since onMove handler on iOS is based on CADisplayLink usage - you may need to add following content in Info.plist if you want to have your animations running at 120 FPS on devices with ProMotion displays:

+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>

Event structure

• height - height of the keyboard;
• progress - a value between 0 (closed) and 1 (opened) indicating relative keyboard position.

Handlers

onStart

This function is called before the keyboard movement starts. height and progress values will have destination values, i. e. if keyboard was closed but will appear - these values will have a values like "keyboard is already opened" (progress will be equal to 1 and height will have non-zero value).

useKeyboardHandler(
  {
    onStart: (e) => {
      'worklet';
      const willKeyboardAppear = e.progress === 1;
    }
  },
  []
);

useKeyboardHandler(
  {
    onStart: (e) => {
      'worklet';
      const willKeyboardAppear = e.progress === 1;
    }
  },
  []
);

onMove

This function will be called every frame when the keyboard changes its position.

useKeyboardHandler(
  {
    onMove: (e) => {
      'worklet';
      progress.value = e.progress;
      height.value = e.height;
    }
  },
  []
);

useKeyboardHandler(
  {
    onMove: (e) => {
      'worklet';
      progress.value = e.progress;
      height.value = e.height;
    }
  },
  []
);

Not precise values

There is no corresponding events in iOS for this hook. So values will not be perfectly synchronized with the keyboard.

The same is applied to Android < 11 - these OS versions don't have API for getting keyboard positions during an animation.

onEnd

This function will be called when the keyboard has completed its movement. The event will contain current keyboard metrics.

useKeyboardHandler(
  {
    onEnd: (e) => {
      'worklet';
      progress.value = e.progress;
      height.value = e.height;
    }
  },
  []
);

useKeyboardHandler(
  {
    onEnd: (e) => {
      'worklet';
      progress.value = e.progress;
      height.value = e.height;
    }
  },
  []
);